Blister of finger(s), infected

This code signifies an epidermal separation on the finger(s) containing serous fluid, which has become secondarily infected. It represents a localized inflammatory response to an infection within a blister.

Use this code when documentation specifies a blister on the finger(s) with clear signs of infection, such as erythema, purulent drainage, warmth, or tenderness. This code is appropriate for conditions like infected friction blisters, contact dermatitis with secondary infection, or other blister etiologies that have become infected.

• Ensure documentation explicitly states "infected" in relation to the finger blister.
• Distinguish from non-infected blisters; if no infection is present, a different code for an uninfected blister would be appropriate.
• Consider an additional code for the underlying cause of the blister if known and clinically relevant (e.g., contact dermatitis).